It is concerned about only their own sales. Summarize all these people seemed to work for us. A doctor should be interested in health patients. And it is logical to team up with another doctor, to understand the strengths and weaknesses of both techniques and to build the best system of treatment. The same with sewing. Are fashion magazines and schools do not want to make us nice and easy dressed? It is logical to assume that if something fails you, then you can contact the customer to recommend a colleague to 'the shop'. In my opinion, the sellers in the market would be good to know that there are other shops with the same product.
Today you you will send the buyer to a neighbor, and tomorrow it will do it when not required will be in stock products. Benefits and buyers and sellers. Tension and mistrust, but you've already sensed a trick. Competition. In theory – yes, these people have to work for us (as, indeed, and we – for each other). But in practice, we care about them, and the doctor and the dressmaker and the seller.
They are only interested in the prosperity of businesses, their own income and a desire to 'drown' competitor. And note this, the average business level. The higher the income, the more stringent methods are used, up to the physical elimination of a competitor on the one hand, and destructive to the sale of medicines and emergency houses – on the other.